i have changed them in both above mentioned transmissions, very simple and messy. Basically get a big drain pan, get under vehicle loosen all the pan bolts and let all the transmission fluid drain out. Unhook your battery to be safe, you will be able to compare your new solenoid to your old one as they all look different in size and shape. Unplug electrical connector at solenoid, slide old one out put new one in and boom reverse the process. While you have it apart, replace your filter which will actually be covering the valve body when you drop the pan. And clean the magnet which is mounted inside the pan, depending on which transmission 6-8 quarts to refill. $20 part and lots of labor, but you can do it!!

Definitely agree on the "not hard just messy" part. I've found the giant aluminum cooking sheets are fantastic for catching the draining. Other than that, a small kids pool slid under the transmission. Without a huge drain pan, I've never been able to take one of those things off without getting fluid everywhere. The first time I did one, it was all over the driveway. If you don't have a large enough drain pan, I recommend purchasing the oil spill cleanup stuff in a bag from the autoparts store. $5 will save you a lot of wiping. LOL